目录1. 概述2. 理论说明3. 举例说明总结1. 概述 mysql中的左连接（LEFT JOIN）和右连接（RIGHT JOIN）是两种外连接方式，核心区别在于保留哪个表的全部数据。左连接以左表为主，右连接以右表为主。两者本质对称，实际
We want to add a comments/reviews feature to our website\'s plugin gallery, so users can vote up/down a particular plugin and leave an optional short comment about what they liked or didn\'t like abou
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